Disk drive adjusting write clock frequency to compensate for eccentricity in disk rotation
US7251098B1 · kind B1 · utility
112Cited by
23References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 19, 2004 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | Nov 19, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed that estimates a sinusoidal error in a wedge time period due to eccentricity in the disk rotating to generate eccentricity compensation values. During a write operation a head is positioned over a target data sector within a target track, a write clock frequency is set using an eccentricity compensation value corresponding to the target data sector, and data is written to the target data sector using the write clock frequency. In this manner, the eccentricity compensation value adjusts the write clock frequency to better optimize the linear bit density from the inner to outer diameter tracks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.